BBC NEWS | Science/Nature | Humans blamed for climate change
As climate change skeptics and scientists argue out whether human activity is the cause of global warming - we are seeing the disintegration of the ice that has been there since the last ice age and as we continue to argue this ice melts, makes the situation worse until the atmosphere saturates and then the atmosphere will change. Perhaps that will cause the atmosphere to become more laden with clouds.
Nobody is asking the question - why these masses of ice appeared. If they melt it would change the map of land significantly. Are they what remains of the last ice age? Restoring things (which is what nature does) would require another ice age. And if the system (weather) becomes over saturated, it is possible that a precipitous ice age could ensue.
C02 may trap heat, but extensive cloud cover may reduce heat.
Science needs to answer the question of why ice ages occur so often - it seems a macro instability in the system. In this system a human lifetime is not significant. 500 years from now, it may well become a problem that humanity can do nothing about.
But we can do something about it now.
IPCC Report
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